Bed-spring.



F. KARE.

BED SPRING.

APILIGATION FILED JAN.29. 1909- 997,298, Patented July 11, 1911.

aumntoz Francis Karl" I W/w UNITED STATES PATENT OFFICE.

FRANCIS KARE, OF HOLLAND, 'MICHIGAN.

BED-simmer.

Specification of Letters Patent.

Application filed January 29, 1909. Serial No. 475,060.

To all whom it may concern:

Be it known that I, FRANCIS KARR, a citizen of the United States,residing at H01- and securing elements may be made in.

highly tempered spring wire without danger of breaking the wire wheninterweaving or interlocking the several springs or parts of springstogether, and, third, to provide a means whereby a cloth, or otherfabric .tube

or covering, may be drawn over the wire that forms the spring after thespring has been made and re-tempered, thus averting the danger ofburning the covering during the process of retempering. I attain theseobjects by the construction shown in the accompanying drawing in which-Figure 1 is a plan of the top coil of a spring showing a horizontalcrimped or serpent-inc formation at one end, and indicating acorresponding vertical crimp in the body of the spring, the two beingcovered, to be interwoven or interlocked to fasten them together. Fig. 2is an elevation of the same showing the vertical crimp or serpentineportion in the body of the spring. Fig. 3 is a perspective of the sameshowing the crimped portions of the spring assembled, and, Fig. 4 is aplan of the upper coils of adjacent springs showing the manner in whichthey are secured together.

Similar letters refer to similar throughout the several views.

, My main object in the construction of these springs, is to enable meto place a fabric covering over high tempered springs,

parts and as it is necessary to heat the completed springs to a highdegree, after they are formed, for the purpose of increasing theirelasticity, I have found it impossible to use covered wire for suchsprings as the'heat necessary for re-tempering is suflicient to burn anddestroy the covering. Hence, I have found it necessary to provide somemeans whereby the covering may be placed Patented July 11, 1911.

over the wire after the spring has been completed and retempered, and,then, the parts may be interwoven or interlocked to form a connectionthat will hold the parts firmly together. To attain this object I placethe portions of the spring, A, that are to be united, under a proper dieand form a crimped or serpentine portion, a, at the end of the spring,projecting in one direction,

and a correspo-ndlng crimped or serpentine portion, a at the desiredposit-ion in the body of the spring, with the serpentine crimpsoppositely located or at right angles with those at the end so that thetwo may be readily interwoven, as shown at A in Fig. 4, where the end ofone spring is interwoven with the body of an adjacent spring, or. at A,in the same figure, where the end. of a spring is represented as beinginter ven with an inner coil of its integral wire;

upper coil of an adjacent being twisted or knotted.

' I have found it ve difiicult 'forn'fi the ordinary securing knot orloop in spiral spring wire that is covered without cutting or tearingthe covering B, while with this construction the spring may be whollyformed and ready for interweaving or securing together before the coveris put on, and the cover may, then, be put on and the crimped portionsinterlocked or woven without any possible danger of injuring the cover.I find this construction very advantageous, for several reasons. First,the crimping may be done with a press, with a punch and dies,

knot or twisted fastening for wires, a much more highly tempered wiremay be used,

than would be possible with, the ordinary knotted spring construction.Third, this and with the construct-ion permits of'interweaving the endcoils of adjacent springs together firmly, reliably and more readilythan ordinary knots or other connections may be formed, thus producing afirm union of parts where it would be impossible toform a closely lockedand non rotating twisted connection. Fourth, if desired, the fabriccovermay be utilized to stitch through to secure the coils firmly butpliably together where adjacent spring coils meet; and, fifth, with thisconstruction the end, a, of the spring A may be interwoven with a singlewire of the adjacent spring, as at A, or it may be made to include aportion of a coil of an adjacent spring, as at A, in Fig. 4, to firmlysecure the two surface coils of adjacent springs together, thus forminga reliable surface construction and securing the terminal coils of thesprings at the same time and at one op- .eration.

What I claim as new, and desire to secure by Letters Patent of theUnited States, is:

1. In spiral spring bed construction, the ends of the spring wirecrimped to form several directly oppositely disposed bends in onedirection, and the adjacent portion of the body of the wire crimped toform several directly oppositely disposed bends at right angles withthose in the end of the wire and the two interwoven to securely unitethem for surface construction.

2. In spiral spring bed bottom construction, the ends of theouter coilsof springs crimped to form several directly oppositely disposed bends inone direction, and the connecting portions of thebodies of adjacent Isprings crimped to form several corresponding bends at right anglestherewith, and all interwoven to securely unite the parts for surfaceconstruction.

3. In spiral spring bed bottom construction, a portion of the ends andbodies of adjacent coils crimped to form several serpentine direct bendsin each at right angles with those in the other, and the oppositelydisposed serpentine portions interwoven to form substantial surfaceconstruction.

4:. In spiral spring bed construction, the

'ends of the outer coils of the spring wires crimped to form severaldirectly oppositely disposed bends in one direction, the adjacentportion of the body of the wire crimpedto form several directlyoppositely disposed bends at right angles with the bends in the end, anda fabric covering drawn over the coils after they have been crimped andretempered, and the crimped portions interwoven to form surfaceconstruction, as and for the purpose set forth.

Signed at Grand Rapids Michigan J anuary 25 1909.

FRANCIS KARR. In presence of I. J. CILLEY, GEORGE Tooeoon.

